"hair's breadth" meaning in English

{
  "forms": [
    {
      "form": "hairs' breadths",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "hairs' breadths"
      },
      "expansion": "hair's breadth (plural hairs' breadths)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "by a hair's breadth"
        }
      ],
      "examples": [
        {
          "text": "We won by a hair's breadth.",
          "type": "example"
        },
        {
          "text": "He missed me by a hair's breadth when he ran past me yesterday.",
          "type": "example"
        },
        {
          "text": "They came within a hair's breadth of contacting electrified water.",
          "type": "example"
        }
      ],
      "glosses": [
        "A very small amount or distance."
      ],
      "id": "en-hair's_breadth-en-noun-xy3HSyOd",
      "raw_glosses": [
        "(idiomatic) A very small amount or distance."
      ],
      "related": [
        {
          "word": "to a hair"
        }
      ],
      "synonyms": [
        {
          "word": "hairsbreadth"
        },
        {
          "word": "hairbreadth"
        }
      ],
      "tags": [
        "idiomatic"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "very small amount or distance",
          "word": "karvan verran"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "very small amount or distance",
          "word": "hitunen"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "very small amount or distance",
          "tags": [
            "feminine"
          ],
          "word": "Haaresbreite"
        },
        {
          "code": "hu",
          "lang": "Hungarian",
          "sense": "very small amount or distance",
          "word": "hajszálnyi"
        },
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "very small amount or distance",
          "tags": [
            "masculine"
          ],
          "word": "piczy włos"
        },
        {
          "code": "cy",
          "lang": "Welsh",
          "sense": "very small amount or distance",
          "word": "lled blewyn"
        }
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-a hair's breadth.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/5/58/En-au-a_hair%27s_breadth.ogg/En-au-a_hair%27s_breadth.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/5/58/En-au-a_hair%27s_breadth.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "hair's breadth"
}

{
  "derived": [
    {
      "word": "by a hair's breadth"
    }
  ],
  "forms": [
    {
      "form": "hairs' breadths",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "hairs' breadths"
      },
      "expansion": "hair's breadth (plural hairs' breadths)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "to a hair"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with audio links",
        "English terms with usage examples"
      ],
      "examples": [
        {
          "text": "We won by a hair's breadth.",
          "type": "example"
        },
        {
          "text": "He missed me by a hair's breadth when he ran past me yesterday.",
          "type": "example"
        },
        {
          "text": "They came within a hair's breadth of contacting electrified water.",
          "type": "example"
        }
      ],
      "glosses": [
        "A very small amount or distance."
      ],
      "raw_glosses": [
        "(idiomatic) A very small amount or distance."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-a hair's breadth.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/5/58/En-au-a_hair%27s_breadth.ogg/En-au-a_hair%27s_breadth.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/5/58/En-au-a_hair%27s_breadth.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "synonyms": [
    {
      "word": "hairsbreadth"
    },
    {
      "word": "hairbreadth"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "very small amount or distance",
      "word": "karvan verran"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "very small amount or distance",
      "word": "hitunen"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "very small amount or distance",
      "tags": [
        "feminine"
      ],
      "word": "Haaresbreite"
    },
    {
      "code": "hu",
      "lang": "Hungarian",
      "sense": "very small amount or distance",
      "word": "hajszálnyi"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "very small amount or distance",
      "tags": [
        "masculine"
      ],
      "word": "piczy włos"
    },
    {
      "code": "cy",
      "lang": "Welsh",
      "sense": "very small amount or distance",
      "word": "lled blewyn"
    }
  ],
  "word": "hair's breadth"
}